#include<iostream>
#include<stdio.h>
#include<string.h>
#include <unistd.h>
int main()
{
    //库函数调用
    printf("hello printf\n");
    fprintf(stdout,"hello fprintf\n");
    const char * message="hello fwirte\n";
    fwrite(message,strlen(message),1,stdout);

    //系统函数调用
    const char*mes="hello write\n";
    write(1,mes,strlen(mes));
    fork();
    return 0;
}

